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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c153c3ce8152f28a95bfc6b114877edc348cb049d6591792717ccc3ac0f73b5a' 
  AND token = 'otNj8NGxzz80JUbFKMa2pCl6C+NzOAhf6tKgmuUIe9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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