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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9ace48cf86a9d145b0a8a9255e4595b172d943dc1e2eedef9a4c7deb5890d88' 
  AND token = '+vV3XrhMMCw+pjHs1m4JeHWBNHOarKg12dFc8tul8r8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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