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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fea39deb519fc95585441f47542fb9ed9fe9b26e5f9b63af7b62fc5c3df7c21' 
  AND token = 'WWHCM14cVAAONXIVo/rQCMGrjM2ex7IESFRocsfC2t0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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