SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7842500350f82f45ecb186bae4f429ad6417219917c6708778f7d1f8d6b34087' 
  AND token = 'Ax0zBCXopu3g0+aOXI/4ARS9G4g6hgTTZbYJJNI1NfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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