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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7473f46a9622fab852b720685773b04e521ca617ffd8291a6fc213f04ab2ea2' 
  AND token = 'aUbyVA2j5PObcmHUkaVsUYsTBRQozzeJvB7cg1JR5P8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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