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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9678651cc29bde26fcf50485cb7f91156db09d22111862634bdb1d29e1dcd825' 
  AND token = 'xL8ltiHfJ6gKn/xNSLMA8sL0UdTTifM+z2QCsnUqbXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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