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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e176160808c51aba072565c7974498123b29fd8efd6f9009aa433d4e5ac8bb6' 
  AND token = '79weD53bXBjIHCI2AuWuaQxauRF3MYudpcpe9I4PBTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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