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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9f285eee55156350f1446fd33008590be911940bd97ddf26ab4a96a4b3822b0' 
  AND token = 'jPa8olwkxzehjqfz8ULSOEAjKFRzrTkzk/A3CQY3Vcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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