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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be0cc66d356655bf18a8bc8d6c8d68ec9a6e88a636df5ea8b3bfed5c5cdbc5d7' 
  AND token = '/853Zdf9sVkQotjIUmaO0A/YcF0GFjC+JC/G9tyEFhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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