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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '858ccf022466257e4fee6def0a54d79cfe736ab3c2df769345e712f368933614' 
  AND token = '6q0Wl5bZUF4j6Vt6/t8F5wko74qgXMj35nbKNvMixNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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