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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '438c67d093f7686c3fb66f22cff6f6caf94c010b34fc1ffdff3276157690765d' 
  AND token = 'D7oGJPs9p4R8CP1mBeDtAYsI9mWBbn2MD19/LDpKCZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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