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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50d13b13339faf65e6f1a139219e65841cf919c12eb1db247049a9c6f1062c08' 
  AND token = '31yxZxjmjODjNNrUpHqJmaO9X4y3AZpZyQ4bUisBo6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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