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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e99a1eac7aac81c8a40d12834ae1cf8640f8ab5c81c84c851ff9115abb2c57ba' 
  AND token = 'yeElxlr8Uaf/oHH2FXRg0OL28YhOZkf61LtDZwL25os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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