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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32d41ae3d39ca8680c6c7e4092554a6e49b6e0afe4e56649a4d751061bfd12eb' 
  AND token = 'vW1INrjngzk6rPI1Ho/UhT6lD9J26WbnyRLD6Jrcm48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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