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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db8cd17d64bad00f5f7cbb7c946fa1f2e505ce9801bffaa9c35b5fc0689ba335' 
  AND token = 'Ku6EL9y6b3KfgtmqtvoNwonSxiD8UeNZzhCPRzUf1bA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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