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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '625414c4c4a18c91d0e7b242ec79d01ea7bf1943c5f22b2772187c81ced587e5' 
  AND token = '8VtQNSDl7v4s57ffQnScO2iBI25yKogdVONRrWkZX6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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