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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27e457a7ccc26f944143e21db2f045f51d04c304cd9bc60af7e6126bd0d69e12' 
  AND token = 'ZkA2YLywGtlTyMQlMjdqcJAouVYRWkBqdDRxD/+AHdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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