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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15bd9499dcd530e1d7a637e0bbff38aa5d1116bf716ae17f2a37a54e132e9d02' 
  AND token = 'YRJ8G9bEkY1LC31sZ+tPvO9wQ4eqQYUxcdVhTU6nru0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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