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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1e085357e24e3c71bba58a44c7aa8f3721485ef729d11826aedbf9fa82293d2' 
  AND token = '28JziYvMFGZBIfo2QAMZd8i8w8g0AIllN87jFeqmuOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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