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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e41e63ab6ea7caadea658287d1c2b0eb6dd2e0750576311b51bf15571ed151f' 
  AND token = 'P3PR18RWPnsuQ2fYJTfz6qrkacY4739XOXOhNpdSMjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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