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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d1d08cdcd2b2477b2c0ba174a3cea61a3d799a15b8377b27842ed4159c54021' 
  AND token = 'uFj9IjZ+fMpfiQgzPLrONee1tgEujHrkvCx/uPQm2qo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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