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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8893067ac513753e916d9baa9eb78c6688a50366f32c8fd35ed5402e47ab60ba' 
  AND token = 'qSZnv8+a/mrkr7Wiokb/gZrNjPuOI8KNlj7O5ty0XEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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