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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f76d7b04988ba04fdef13ed81180a649213de71465f1767963c55a2bb2b3a07e' 
  AND token = '6lk+7Ha/IYptS2fZxGVBQKYlGImd43nnLdum8fnOWX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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