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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12e8fd28b79dc9e8339333b89fd6b1ee90bab25f377025f44e1de70c3b2bb78e' 
  AND token = 'gWN65pn3JFG0nZCfeIypT/L6vs81WA8a6faKy5R7U6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00128

JSON explain

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