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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5c5e8b810d7a3eeb0e6923863392f37a5fc8a4b7c757691446c6deabd00fdce' 
  AND token = 'auReZBZbJfdAQigfe+vFIQGWclLn2SWcaDA5mrCKAMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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