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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40eae4f4517cc4dcb2abd82a3e9e457eed5b328783c486cdadfd08a436e80ec0' 
  AND token = 'TfMvrZt24XKKMiv3ieOSu+b+7O0Uur9h1+AI1PQYCYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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