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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e109789754d153b84bf273e9a0e857856bdb2632b09b39bb1e18eb014d5b9851' 
  AND token = 'xJfgYht910+WHzndubbT5CQoYDCngkGSYoO3jZSQq3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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