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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eed63ed467189b7b53571eff8f23ae7e2838562b02c67882c23373d9968405d7' 
  AND token = 'cQE1sYvGYs3ZzpQjKsRknQEJBfEblGUMv0GxVit52oQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00088

JSON explain

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