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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9047c46714ca8def882d113346b8ba10a8dd1a40786d7d898598ccbd9c79f6d' 
  AND token = '8D4Y0dLqEGAxnjo+qyy6Z/CVRvhzG9bP/6ETer7Kx9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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