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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4441435365452fbea4e08ae871b8bbc47a673b79f7b1939bb5b9a84df815f9c' 
  AND token = 'ccdB7kEbO75R/8MSpugtODuRI4TgnNM51FrgSRVj0h4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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