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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5610ef22266d0f009fd89e143414a3cf0983445f20f5c326de238bf8ce93960' 
  AND token = 'wMmKWK8K1klbDJ9AZebdIZy08bCDLFBPDQqnkcRFuTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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