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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f551c0f453a44dbe25b7d6ace5771d7593463bf1e50ef3e90ec3212dfe8339a6' 
  AND token = 'e6E7GdogAZj4LIUS0T0FLZ0IW9hv0P1zCQeqXTA6y6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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