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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6cc585d1e9243e2740b079d00d5031ba100c599a5161d1f8e8d22deb9f09fff' 
  AND token = 'sQhKIoRdl3AiS60Zl8skiebF3fcA5LJrXjPgx2iQpnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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