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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c547729e5947f9ae10618bbc3804608b7952a48ff791a754e59136f7111d0d77' 
  AND token = 'ODxcBYQ81UtNG63mGa3/DZjjNhwpsrVOs/57Dry3wWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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