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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '791600acb37e1f2714b19abda46dc259c4714322a1100606af48af0a168b8c7a' 
  AND token = '6wX04knxzRTvBYnpljDYMnF8GCFM7wnlQidx/1RWrV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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