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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8af637c411212b8c48ff32d7261c6cc12b0f3f3489650090a3122d9d818cf10e' 
  AND token = 'se2c9tHmMs5jTBwxWWGoFZ5d/4WsR3X6olb6Xx3H0oY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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