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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b814b9a0f476e77080d1125d9bb341a40a55eb318ed892aa6ab7d88df08e751' 
  AND token = 'oBBqOUb55oOMqcA7AKeEux/YY5ueElTVfbSxlrle0r0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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