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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35bf44c96195d3900f0bb0b720c8a44afe34869be7c31b2704ad29fe88218bb2' 
  AND token = 'dIXp5gTXJEWSjQnbT03VtpG2HIxdh5H5qznOdx52MrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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