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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ac81346dd7579a229cfebab6f200fef09b660f4751c996369f9050476952b41' 
  AND token = 'fMkWG7e3CzXPoQyRxvrnNe5VoHQbtxacW3/f1k54HYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}