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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bad924ab29bafa8b9c9755dddfaf4226ff9b29002e4d10e2e51ae2c682552323' 
  AND token = '3nmQzl4s/dm51y+FWvnKnwj9wUd4npWuFgmkhdtapec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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