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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ae303d71d884e07f7d40ada2b2c7dc028eca591bfd34e45b4cd9335a7d1e4a0' 
  AND token = 'o9JSH5gpSCzsoFMyA8sJQPWNs0YEdnwIzAWAWzjK7fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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