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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95921a1d87d2232184e113136e74bb0cc2e6d2bec9671722ff472db53e9bdbbe' 
  AND token = 'VNErr6572TiYl720G34KQE4VvBzWbECaftfpOuOJPeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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