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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68cb0bc584f6734743666301a9bcf086ab8cbbe2f64369343687acece1b67720' 
  AND token = 'CvvWf83CAi7/l7T7Hv5pxYT/ABqLKM6U8hqIElqIjqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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