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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '807646896f81437d1e8fe3c26fa7ef5719f624fb01135a113f8e5f7e18924844' 
  AND token = '5qCUSHmtm2FcUmBoCf7epXFQ2HM7/WdPC8RtLvKMqZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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