SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb1a00c438d45a8e28eb6b197ff84741ae7ec841f498d884ed6a089624d9590b' 
  AND token = '1H3a7P7vvmCp0sjQVq/wx/HnLBYvHKs0VYhSuUbFyso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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