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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4f55481fcc18bb4196405cf86add58fcba284bc9ccb86666a55863d799ec35a' 
  AND token = 'oX2xR6hlbMYVK6sWk5gH4AK0NFuPKU9+h1lzOoyWyFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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