SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ee92a4dbfbec3ab51245d00344c6c17244ecbab1c6f1382ed5a7d5ad8c0c671' 
  AND token = '1BhI3V/HeJhqxFToyLD1zErCufvXUVO2LjteIggYXP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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