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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '368f1824869c54372b93020af22ae12d49f23f4bc67c83dcaf8b94f27ad226f9' 
  AND token = '4AFaBAh/hRALLXcb6AUKkXB8Pz6FeI0JH5umPrKwlMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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