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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31b30a983225b874a72b9df70a6767136f77ff97a5f6e1b2bbeabcee00ac8de5' 
  AND token = 'jwxqolksZD3x8gH9rPqKkeMMn4mqrSEjKzBUP4KxdeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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