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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8efa6c4e1ddcbd1aafc7a971471a8b2eef25663559a7804fa59718bf2e794f4' 
  AND token = 'InSWAA0UTNJieuq94ujCBd01Uq8y2+AMLby363IMbrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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