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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc496e5777001ea6f6daa80ab52ef55756fb798994de45db4029b5e9f1597623' 
  AND token = '9zVY+wPJ+qTmjipoRFgg0dCb+tTGJG0W5+eWE0u8jEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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