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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15b0c85eb579c2aa31499ffd14cd978ed9ec1b186b9fbdefffe2e7ee083687ee' 
  AND token = 'L0ZYU4T/Ko9dNHUEzGQj4gCyX1JV8pK2MA9w5gPr1/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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