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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaae6c75e07b9586e1efe9e71ee18ec1c59b84ac41487ab99bcde7c0c06400a8' 
  AND token = '6iYrNs6Rf6lSvV4tt258D38yhjAfOSzrybtrCEkghlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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