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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '582948473adb0b28bc13cc90b19de70223f917ea593cfe5f9fa511088b1ce684' 
  AND token = 'WuEMtT+yvjKK9uuM9hMt9iN17Dh4dTXLSw4ar7KMX1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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