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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de34a4c996148a9781a26e701686b5fa1f8dc72c7d4765bd8dde550ec7d88ed9' 
  AND token = 'Orl2B37X+P17Myf1n3lMi5ordVkLMNKbbVA/DjTWKmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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