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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '776f6a2aa139f8d8bb653585787116421f8f5a4b6945826d7ff58bbfa3ae9c31' 
  AND token = 'w/0bo8AxxGJ78xDIgTEGopEufxEsxlorEPOH4wlge04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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