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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '512f7871bec8b28c34fbda61754ecb34595b3067bd895ab180acab442f21920e' 
  AND token = 'apJfp4j+OR82+/WlfcwpFB75AJSbocEzXc2fNvA/tp0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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