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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bac4c3075b69d871091875de8cd66d59ff866d9ea7f227c3fc9f8a45432ecfcd' 
  AND token = 'CsyRmxXdUS0BRuRAXmPmXdIAHsQpoA9+Wy4/uxuHZXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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