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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c3a41ccfe4f6b9b205f0252500eb884231547d4ca528013ec428cb5289fc44e' 
  AND token = '9/ChZmJkSJbf7OYlLt0jGizZPCLNQ0kqlfn1nX3a4IM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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