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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faa9d7de46145ce03acaf5258cdb7680f9ef4ca7fa0422785a6c463788268e43' 
  AND token = 'ChKpcdYRA4pvD8Z8pymusndrAhOKdgtmvYcmshIn/vE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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